25216169617 has 4 divisors (see below), whose sum is σ = 25344170676. Its totient is φ = 25088168560.

The previous prime is 25216169431. The next prime is 25216169633. The reversal of 25216169617 is 71696161252.

It is a Cunningham number, because it is equal to 158796²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24706809856 + 509359761 = 157184^2 + 22569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25216169617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25216169317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64000234 + ... + 64000627.

It is an arithmetic number, because the mean of its divisors is an integer number (6336042669).

Almost surely, 2^25216169617 is an apocalyptic number.

It is an amenable number.

25216169617 is a deficient number, since it is larger than the sum of its proper divisors (128001059).

25216169617 is a wasteful number, since it uses less digits than its factorization.

25216169617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128001058.

The product of its digits is 272160, while the sum is 46.

The spelling of 25216169617 in words is "twenty-five billion, two hundred sixteen million, one hundred sixty-nine thousand, six hundred seventeen".